Question

Can someone help with question B please it's urgent ​

Answer 1

| B | = - 9

Explanation:

The determinant of a 2 by 2 matrix B =
`\left[\begin{array}{ccc}a&b\\c&d\\\end{array}\right]` is

| B | = ad - bc

Then for

B =
`\left[\begin{array}{ccc}0&1\\9&8\\\end{array}\right]`

| B | = (0 × 8 ) - (1 × 9 ) = 0 - 9 = - 9